Fuel Pressure Regulator
- If fuel pressure gauge is already attached, go to next step. If gauge is not attached, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. Hang pressure gauge vertically.
- Connect Pressure Gauge (83-93-514 ) and "Y" connection to vacuum port of fuel pressure regulator. Hang pressure gauge vertically. Connect cooling system pressure tester to "Y" connection.
- Turn ignition off. Remove fuse No. 30 on 900 Series or fuses No. 14 and 22 on 9000 Series. Connect jumper lead between fuse No. 27, 28 or 29 and slot of fuse No. 30 on 900 Series, or between fuse No. 22 and slot of fuse No. 14 on 9000 Series. This will provide current to fuel pump. Turn ignition on.
- Fuel pressure should increase to about 36-43 psi (2.5-3.0 kg/cm2 ). Using a cooling system pressure tester, increase system pressure as specified in REGULATED FUEL PRESSURE (PRESSURE APPLIED) table. Compare fuel pressure to specification.
- Remove cooling system pressure tester. Install vacuum pump to "Y" connection. Fuel pressure should be about 36-43 psi (2.5-3.0 kg/cm2 ). Use vacuum pump to reduce system pressures as specified in the REGULATED FUEL PRESSURE (VACUUM APPLIED) table. Compare fuel pressure to specification. Disconnect vacuum pump.
- Turn ignition on to operate fuel pump. Verify fuel pressure is 36-43 psi (2.5-3.0 kg/cm2 ). Turn ignition off. Pressure should drop 1.4-2.8 psi (.1-.2 kg/cm2 ) and then hold steady for at least 10 minutes.
- If pressure drop is more than specified, check for leakage in pressure regulator and fuel pump nonreturn valve.REGULATED FUEL PRESSURE (PRESSURE APPLIED)
Applied Pressure: psi (kg/cm2 ) Line Pressure: psi (kg/cm2 ) 0 (0) 36 (2.5) 2.8 (0.2) 38 (2.7) 5.7 (0.4) 41 (2.9) 8.5 (0.6) 44 (3.1) REGULATED FUEL PRESSURE (VACUUM APPLIED)Applied Vacuum: In. Hg Line Pressure: psi (kg/cm2 ) 0 36 (2.5) 5 33 (2.3) 11 30 (2.1) 16 27 (1.9)